Generation of biogenic gas occurs under environmental conditions different from those of thermogenic gas (Rice and Claypool, 1981; Whiticar et al. 1986; Shurr et al., 2003). Microbial activity takes place at shallow depth in a semi-open system where sediments are not fully compacted, seal integrity is not well developed, and accumulation and leakage of microbial gas are competing processes. Thus the formation of a commercial biogenic gas field needs both sufficient microbial activity to maintain gas supply and an efficient entrapment mechanism to minimize gas leakage. This depends on not only the temperature and other microbial...
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